Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal

Laurita, N. J.; Ron, A.; Shan, Jun-Yi; Puggioni, D.; Koocher, N. Z.; Yamaura, K.; Shi, Y.; Rondinelli, J. M.; Hsieh, D.

doi:10.1038/s41467-019-11172-2

Title: Evidence for the weakly coupled electron mechanism in an Anderson-Blount polar metal

Journal Article · 19 July 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-11172-2 · OSTI ID:1619645

Laurita, N. J. ^[1]; Ron, A. ^[1];

^[1]; Puggioni, D. ^[2]; Koocher, N. Z. ^[2];

^[3]; Shi, Y. ^[4];

^[2]; Hsieh, D. ^[1]

California Inst. of Technology (CalTech), Pasadena, CA (United States)
Northwestern Univ., Evanston, IL (United States)
National Inst. for Materials Science (NIMS), Tsukuba (Japan)
Chinese Academy of Sciences (CAS), Beijing (China)

Over 50 years ago, Anderson and Blount proposed that ferroelectric-like structural phase transitions may occur in metals, despite the expected screening of the Coulomb interactions that often drive polar transitions. Recently, theoretical treatments have suggested that such transitions require the itinerant electrons be decoupled from the soft transverse optical phonons responsible for polar order. However, this decoupled electron mechanism (DEM) has yet to be experimentally observed. Here we utilize ultrafast spectroscopy to uncover evidence of the DEM in LiOsO₃, the first known band metal to undergo a thermally driven polar phase transition (T_c ≈ 140 K). We demonstrate that intra-band photo-carriers relax by selectively coupling to only a subset of the phonon spectrum, leaving as much as 60% of the lattice heat capacity decoupled. This decoupled heat capacity is shown to be consistent with a previously undetected and partially displacive TO polar mode, indicating the DEM in LiOsO₃.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE

Grant/Contract Number:: SC0010533; SC0012375; DE SC0010533

OSTI ID:: 1619645

Alternate ID(s):: OSTI ID: 1597627; OSTI ID: 1830823; OSTI ID: 2473686

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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